remove duplicates and add SI units

Thesis/acronyms.yaml

@@ -10,6 +10,9 @@ acronym:
     - id : cellid
       short: Cell-ID
       long: Cell Identification
+    - id: ghz
+      short: GHz
+      long: Gigahertz
     - id: gps
       short: GPS
       long: Global Positioning System
@@ -22,6 +25,9 @@ acronym:
     - id: ism
       short: ISM-Band
       long: Industrial, Scientific and Medical Band
+    - id: mhz
+      short: MHz
+      long: Megahertz
     - id: rss
       short: RSS
       long: Received Signal Strength
@@ -40,9 +46,3 @@ acronym:
     - id: wifi
       short: WiFi
       long: Wireless Fidelity
-    - id: aoa
-      short: AoA
-      long: Angle of Arrival
-    - id: wifi
-      short: WiFi
-      long: Wireless Fidelity